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    John P Duddlest's Avatar
    John P Duddlest Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Feb 16, 2009, 04:39 PM
    Furnace burner won't stay lit
    I have an older model Night & Day model c100u series 510 gas furnace. The burner won't stay lit when the thermostat kicks on. I replaced the thermocouple but the burner still lights then immediately goes out. Any help?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
    Ultra Member
    		  
    #2

    Feb 16, 2009, 05:34 PM
    Which burner - main or pilot? If main, try this: Locate the thermostat control wire connections at the furnace, remove wires from "R" and "W", and place a jumper across the terminals. This will bypass the thermostat circuit. Does the unit run continuously now? If so, you have a problem with the thermostat and/or wiring. Post back results.
    John P Duddlest's Avatar
    John P Duddlest Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Feb 18, 2009, 01:04 PM
    Upon further investigation it became clear that my blower motor was fried, so apparently the main burner shut down when the fan would not come on. I have a new motor on order, when I get it installed we will see if that does the trick. Thanks for your help.
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